Physics Y8

Physics Y8

1. Refraction

   • Refraction is when light bends through the normal (90 degrees). This is when the line shows the points where the ray of light enters the glass block and where it leaves again.

2. Sound

   • Sounds can be seen by waves using an oscilloscope.
   • When an object or substance vibrates, it produces sound. These sound waves can only travel through a solid, liquid or gas.
   • Sound waves are longitudinal waves - the vibrations are in the same direction as the direction of travel

3. Reflection

   • Sound waves can reflect off surfaces. We hear sound reflections as echoes. Hard, smooth surfaces are particulary good at reflecting sounds. This is why we empty rooms produce lots of echoes.
   • Soft, Rough surfaces are good at absorbing sound. This is why rooms with carpets and curtains do not usually produce lots of echoes.